The coordinates of the turning point and the equation of the line of symmetry can be found by writing the quadratic expression in completed square form. Find the equation of the line of symmetry ...

={4}\) we would have to square both sides of the equation to recover "\({P}=\)". This would give \({P}\) = 16. The same logic must also be applied when we are changing the subject of a formula.

On October 16 1843, the Irish mathematician William Rowan Hamilton had an epiphany during a walk alongside Dublin's Royal Canal.